Sena Bluetooth SM10 v1.1 User's Guide - Manual (Page 16)

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6.2 Using with a headset
1. Turn on Bluetooth headsets that are already paired with the
SM10.
2. Turn on audio device connected with SM10 and play the
music.
3. Turn on the SM10.
4. The SM10 automatically connects to the paired Bluetooth
headsets. You will then hear the music or other audio sound.
5. If you can’t hear any sound, press the Pairing Button of
the SM10. The SM10 tries to connect the paired Bluetooth
headset again.
Note:
1. The SM10 does not allow all control functions of your audio device over
Bluetooth AVRCP. In this case, the play/pause functions are controlled
from the audio device itself with the forward/backward tracking functions
supported by the SM10.
2. If there is a GPS system connected to the SM10, the turn-by-turn
navigation audio will not be heard if you have an conversation on your
cellphone or intercom. This is due to the set priority within the SM10.